Engine-governor



(No Model.)

H. L. FREEMAN.

ENGINE GOVERNOR.

Patented Sept. 15, 1891,

s'cn, momma, msmmmu, 0. c.

NITED STATES PATENT OFFICE.

HORACE LIZZELLE FREEMAN, OF LEXINGTON, NORTH CAROLINA.

ENGINE-GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 459,545, datedSeptember 15, 1891.

Application filed March 27, 1891.

T0 (ZZZ whom it may concern.-

Be it known that I, HORACE LIZZELLE FREE- MAN, a citizen of the UnitedStates, residing at Lexington, in the county of Davidson and State ofNorth Carolina, have invented a new and useful Engine-Governor, of whichthe following is a specification.

This invention relates to governors for steam-engines; and it has forits object to provide a device of this class which shall be simple inconstruction and absolutely automatic in its operation, and which shallserve, when additional load is to be overcome by the engine, to furnishan increased steam-supply to enable the machine to overcome such loadwithout reduction of speed.

with these ends in view the invention consists in the improvedconstruction, arrangement, and combination of parts, which will behereinafter fully described, and particularly pointed out in the claims.

In the drawings hereto annexed, Figure 1- is a vertical sectional Viewof a steam-engine governor constructed in accordance with my invention.Fig. 2 is a perspective view of the same.

Like numerals of reference indicate like parts in all the figures.

1 designates the valve-casin g, which is connected with the steam-supply pipe in the usual manner, it being provided with the inlet 2.

3 designates a valve having a stem 4, which extends through apacking-box 5 in the top of the valve-casing and is connected in theusual manner with a centrifugal governor, by means of which the saidvalve shall be opened when the speed is reduced, and vice versa, as isusually the case. In thelower part of the Valve-casing is arranged anadditional valve 6, having a stem 7. The pipe 8, through which steampasses from the valve-casing 1 to the engine, is provided with anenlargement 9, having a transverse opening 10, in which a packing-box 11is located for the passage of the valve-stein 7.

Suitably pivoted to brackets projecting from the enlarged portion 9 ofthe pipe 8 are the levers 12 12, the inner ends of which are connectedwith the lower end of the valvestem 7. The outer ends of said leverscarry Serial No- 386,590. (No model.)

the weights 13, which are held adj ustably upon said levers by means ofset-screws 14. The levers 12 are connected by means of links 15 with thestems 16 of pistons 17, working in the vertically-arranged cylinders 18,of which there are two, and the lower ends of which are connected bymeans of pipes 19 with the front and rear ends of the enginecylinder 20,so as to take steam and exhaust simultaneously with the latter, one ofthe said cylinders 18 taking steam while the other is exhausted. Thelevers 12 are connected with each other by means of the pin 21, by whichthe links 15 are pivotally connected with said levers, thus causing thelatter to operate in unison. The upper ends of the cylinders areprovided with air-cocks 22, by means of which the quantity of air abovethe pistons in said cylinders may be regulated, so as to offer anydesired degree of resistance to the upward movement of said pistons. Theenlarged portion 9 of the pipe 8 is provided with brackets 23, in whichsetscrews 24: are mounted to support the levers 12 and to prevent thedownward movement of the latter below a given point.

The operation of this invention will be readily understood from theforegoing description, taken in connection with the drawings heretoannexed. The weights 13 are first adjusted upon the levers 12 to anydesired position, so as to cause the valve 6 to occupy the desiredposition in the casing when the machine is running without a load orwith a light load. lVhen load is put upon the machine, the tendency isto slacken the speed, thus causing the centrifugal governor to act toopen the valve 3, thus admitting an increased quantity of steam. Thepressure in the engine-cylinder being thus increased, the pistons 17 inthe cylinders 18 will be forced in an upward direction, thus opening thevalve 6, and thus further increasing the steam-passage and enabling theresistance caused by the additional load upon the engine to be overcomewithout a reduction of steam or speed.

I do not broadly claim cut-off valves operated simultaneously by acentrifugal speedgovernor; but I limit myself to the construction hereindescribed and claimed.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States 1. In a device of the classdescribed, the independent and disconnected cut-off valves arranged in asingle casing and operated, respectively, by a centrifugal governor andby the steam-pressure in the engine-cylinder, substantially as setforth.

2. In a device of the class described, the combination of thevalve-casing, the valves, a pair of levers connected with the stem ofone of said valves, the cylinders having pistons connected with saidlevers, and pipes connecting the said cylinders with the ends of theengine-cylinder, substantially as and for the purpose set forth.

3. In a device of the class described, the combination of thevalve-casing, the valves, the levers connected pivotally with the stemof one of said valves, the weights mounted adjustably in said levers,the cylinders having pistons connected with said levers, the air-cocksat the upper ends of said cylinders,

and pipes connecting the lower ends of the latter with the ends of theengine-cylinder, substantially as set forth.

4. In a device of the class described, the

combination of the valve-casing, the steanr pipe having an enlargedportion provided with a transverse opening, the valves, the leverspivoted in the transverse opening of the v steam-pipe and connected attheir inner ends

